So I'm originally from Minnesota; the places I lived there over the course of 18 years was between 800 - 1,100 feet above sea level. Went to Basic Training in San Antonio, that was 650 feet above sea level. Tech school in Pensacola, that was a hundred feet above sea level. Stationed in Japan for two years, a little over a hundred feet above sea level. Stationed in Dayton, Ohio for five years, 738 feet above sea level. Stationed in England, a little under a hundred feet above sea level (down to about 30 where I work). And now I'm TDY to Colorado Springs: well over a mile above sea level. I decided to go for a run earlier, since I have been, ah, indulging a bit in all the American restaurants I have missed, and I got maybe a block and a half before my lungs were screaming. At first I was severely disappointed in myself, but then one of the Army Warrant Officers I go to class with, who is a beast of a man, rounds the corner looking like death incarnate; he made it only about fifty more feet than I did before damn near kissing the sidewalk. Dear Lord, how am I supposed to learn with so little oxygen!?